198 BYZANTINE CHURCHES CHAp.
alternate compartments. The arms of the cross, the chambers at the angles, and the bema are all covered with cross-groined vaults that spring, like those in the chapel of the Pammakaristos (p. 151), from the vaulting level. The apsidal chambers have dome vaults, a niche on the east recessed in an arch to form the apse, and a niche both on the north and the south rising above the vaulting string-course. In the lowest division of the south wall stood originally a triple arcade with a door between the columns. The arcade has been built up, but the moulded jambs and cornices of the door, and the arch above it, now contracted into a window, still show on the exterior, while the columns appear within the church. Above the column string-course is a range of three windows, the central window being larger than its companions ; higher up in the gable is a single light. The interior of the church has been much pulled about and cut away. The narthex is in three bays, separated by strong transverse arches, and terminates at either end in a high concave niche that shows on the outside. The central bay has a dome vault ; the other bays have cross-groined vaults. The church had no gynecaeum, although Pulgher indicates one in his plan. A striking feature of the exterior are the large semicircular buttresses that show beyond the walls of the church—six on the south side, one on either side of the entrance on the west, and two on the east, supporting the apsidal chambers. In the last case, however, where entire buttresses would have been at once too large and too close together, the buttresses are only half semicircles. The apses project with three sides. The northern side of the church and "the roof are modern, for the building suffered severely in 1784 from fire.1 The church stands on a platform, built over a small cistern, the roof of which is supported by four columns crowned by beautiful capitals. Hence the Turkish name of the mosque, Bodroum, signifying a subterranean hollow. Gyllius2 is mistaken in associating this church with the
1 Chevalier, Voyage de la Prepontide et du Pont JEuxin, vol. i, p. 308.
2 De top, C.P. iii. c. 8, 'habens inter se cisternam, cujus camera lateritia sustinetur columnis marmoreis drciter sexaginta*; cf. Die fyxant. Wasserbehahet,